In a large mixing bowl, combine whole wheat flour, bread flour, and 1/4 cup of the rolled oats.

Blend in the baking powder, soda, salt, and melted butter.

Make a hole in the center of the mixture and add the buttermilk.

Stir until stiff dough forms.

Sprinkle remaining 1/4 cup oats on bread board.

Turn dough out onto board and knead for just 1 minute, shaping it as you go into a round loaf.

Ensure the loaf has a thick coating of oats on the outside.

Cover baking sheet with parchment paper or lightly grease it.

Place loaf seam side down on top of baking sheet.

With a sharp knife, make a cross slash in the top of the loaf about 1/2 inch deep.

Preheat oven to 375°F.

Bake for 35 to 40 minutes or until loaf sounds hollow when tapped.

Transfer to rack and brush generously with melted butter.

Cool for at least 4 hours before slicing.